Hi Everyone, I now have over 26K miles on my 17 AT. After testing pressures from 53-58 psi- 54-55 is the sweet spot. I have done several more of these on others AT's and have had great results. It is a shame that i read all of these posts about poor running, stalling, hesitations- this is the easiest fix- our EFI systems are just too lean. A little more fuel pressure works wonders. Easier install/ cheaper than anything else available. A computer reprogram is the best fix- but costly. all these other devices that "fool" the computer will produce like results- they are just different ways to trick the system into running richer.
The new ATAS uses the same fuel pressure regulator and should respond the same even though the system is slightly different (drive by wire)
when it come to HORSEPOWER, too much is just enough